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Ukko, or Äijä or Äijö (Finnish: male grandparent, grandfather, old man), parallel in Estonian mythology to Uku,is the god of the sky, weather, harvest and thunder in Finnish mythology. Ukkonen, the Finnish word for thunder is the diminutive form of the name Ukko. Some researchers believe that Ilmarinen, another Finnic sky god, is the origin of Ukko, while some others believe that Ukko's original name was Baltic Perkele.